问题 选择题 算一算，选一选。( ) 1. 3 + 5 =? ( ) 2. 9－6 =? ( ) 3. 7 + 2 =? ( ) 4. 10－6 =?( ) 5. 4 + 1 =? A. three B. nine C. eight D. five E. four 答案 1-C 2-A 3-B 4-E 5-D
